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Have you removed the Brake Line? If not: this must be removed in order to remove the cylinder. Use a flare-nut wrench. If you have removed the Brake Lines and Bolts, tap lightly with rubber mallet to loosen.

For AS 3680,
Removed screen.
1. Open the door on the back to remove the wireless antena cables.
2. Open the power cover (remove 2 scews on the power cover).
3. removed keyboard.
4, remove 4 scews (silver scews) that make screen attched the the laptop body.
5. that's all you can remove the lcd now.

For opening the body,
1. Removed all screw on the back, include 1 screw (small scew) under hard drive.
2. removed 3 screws under keyboard
3. removed 1 scew on top side (close to power port), this scews held uppercase and lower case.
4. removed lcd lid cable from board (close to power port)
5. now you can separate upperbody from lowerbody.
6. removed 2 scews from motherboard.
7. removed modem cable, speaker cable, mic cable from the back.
8. that's all, you can removed motherboard+power board.